Keyboard perforator



April 20, 1943. R. A. LAKE KEYBOARD PERFORATOR INVENTOR ROSS A. LAKEATTORNEY April 20, 1943. R. A. LAKE I KEYBOARD PERFORATOR Filed July 5,1941' 2' sheets-Shea 2 INVENTOR ROSS A. LAKE AT-TORNEY Patented Apr. 20,1943 UNITED STATES PATENT OFFICE Corporation, Chicago, 111.,

Delaware a corporation of Application July 5, 1941, Serial No. 401,113

34 Claims.

The present invention relates to peri'orators for telegraphic purposesand more particularly to improvements in a keyboard actuated mechanismfor the perforation of a control strip.

The principal object of the invention is to provide a mechanism forinsuring the reliable operation of apparatus for perforating strips.

Another object is to provide a positive means for precluding thepremature reoperation of the electromagnet of a magnetically operatedperforating apparatus.

A further object of the invention is to provide a mechanism for assuringthe proper step by step feeding movement of the control strip,irrespective of irregular and tremlulous operations of the keys.

To achieve the above and other objects of the invention, a keyboardmechanism is provided which is arranged with a plurality of keysoperatively associated with pairs of vertically movable permutation barsthrough which interponent bars of a perforating mechanism are movedselectively to control the operation of punch pins allotted thereto andto perforate a tape correspondingly.

Specifically, the salient feature of the present invention resides inthe provision of means for more accurately and efiiciently controllingthe period of energization of the perforating electromagnet, to renderit entirely independent of the variations of manual operation, dueprimarily to a momentary closure of the electrical circuit resultingfrom a staccato or incomplete depression of the key, and secondly, tothe tendency to depress a second key before the operation in response tothe actuation of the preceding key is consummated. In the presentdevice, a positive action latch is provided to insure completion of theperforating motion independently of the manual release of the key. Anantichatter means is also provided which is effective in conjunctionwith the positive action latch to insure reliable and consistentoperation of the perforator. Furthermore, a second latch or curb elementis provided which cooperates with the positive action latch andanti-chatter means to insure the completion of the tape feedingoperation.

When a key has been depressed, a contact operating lever permits thepunch magnet contacts to close under their own spring tension, but amoment before such closure is efiected the contact operating lever willbecome latched up by the positive action latch to preclude the punchmagnet contacts being prematurely opened by the release of the keylever. As soon as contact has been made, the perforator armature isattracted, permitting an anti-chatter mechanism to become effectiveduring the very early part of the armature movement, the advantage beingthat the energization of the punch magnet is taken almost immediatelyout .of the control of the contact operating lever and placed under thecontrol of the armature which is actuated by the punch magnet. Theanti-chatter mechanism acts to push the punch magnet contacts togetheragainst their normal spring tension independently of the key operatedcontact operating lever. In this manner, the punch magnet contacts willremain closed as long as the punch magnet is energized, which is so longas the punch operating lever is held latched, or is held manuallyoperated, To break the circuit through the punch magnet, the armatureacts upon the positive action latch to unlatch the punch contactoperating lever which, if the key lever has been released, will returnto its unoperated or initial position to again separate the contactsprings. Consequently, the vibration or chattering of the punch magnetcontacts is prevented. Moreover, when the armature is partiallyattracted it also acts to position a curb member in the path of aprojection of the contact operating lever to prevent reoperation of thecontact operating lever until a complete tape feeding operation has beencompleted. Under such conditions of operation only one group ofperforations appears in the tape for each depression of a key and thetape feeding motions will be rendered invariable.

A better understanding of the invention may be had from the followingdescription, taken in conjunction with the accompanying drawings,wherein;

Fig. 1 is a longitudinal sectional view of the keyboard perforatingmechanism according to the present invention;

.Figs. 2, 3, 4, and 5 are similar fragmentary views of the perforatingmechanism showing the arrangement of the elements under variousconditions of operation;

Fig. 6 is a partial plan view of the perforating mechanism with certainparts removed; to show other parts more clearly; and

Fig. 7 is an elevational view of the back spacing mechanism according tothe present invention.

The keyboard mechanism according to the present invention is of the typedisclosed in U. S. Patent No. 1,965,572, granted 'July 10, 1934, to

C. W. Burcky et al., and reference may be had to said patent for acomplete disclosure and understanding of details not shown herein.

Referring now to the drawings in which like reference characters areused to designate similar parts throughout the several views, there isshown in Fig. l a keyboard I l comprising a base casting I2. Positionedto the rear of the base casting I2 and suitably journaled therein is apivot rod I3 which extends transversely of the casting. A plurality ofkey levers :4 are pivotally mounted on the rod [3 and are normallybiased upwardly by individual springs (not shown). As is theusualpractice, key levers l4 are provided at their forward ends withkeys l5 arranged in banks.

Beneath the key levers l4 and extending transversely thereof, are aplurality of pairs of permutation bars 16 which form a part of aselector mechanism of the type fully disclosed in U. S. Patent No.1,884,753 to which reference may be had for a more completeunderstanding of the details thereof. The structure disclosed in thedrawings is provided for operation in response to a five-unit code, andconsequently, a corresponding number of pairs of permutation bars I5 isemployed. However, a larger or a smaller number of pairs of bars :6 fora corresponding code may be used. Each pair of permutation bars l5comprises a bar I! and a bar I8, and these bars are provided at each endwith vertical slots or notches I9 and 2|, respectively, which fit overguide combs 22 and 23, carrying pivot rods 24 and 25. The bars I! and 18are thus held against longitudinal movement, but are free to be shiftedVertically in resp to the operation of key levers I4 about pivot rod I3.

Pivotally mounted on rods 24 and 25 are pairs of rocker members 26 and21 interposed between each pair of permutation bars IS. The rockermembers 25 and 21 are substantially T-shaped, with their free endsformed with oppositely directed lugs. One of the lugs of each rockermember projects forwardly into a notch on the lower edge of thecorresponding permutation bar H, and the other lug projects rearwardlybe-' neath the companion permutation bar l8. With this arrangement, thedepression of either permutation bar of the pair of bars [6 rocks therocker members 25 and 21 and lifts the companion permutation bar. To thedepending portion of the T-shaped rocker members 26 and 21 is pivotallyarticulated a longitudinally movable permutation bar 28. Thus, when thepermutation bars i1 and 13 are moved vertically, in a manner to bedescribed presently, in accordance with the depression of a key leverl4, thepermutation bar 28 individual to each pair of the permutationbars I1 and I8 is moved longitudinally, or in the direction of itslength. I

Each of the key levers I4 isarranged, when operated, to engage anddepress one of the permutation bars of each pair of permutation bars ISand to shift these permutation bars in accordance with a character codecombination. To achieve this object, the upper edges of the permutationbars [1 and iii are notched to provide high and low portions inaccordance with the respective code combinations. Also, the bars of eachpair of permutation bars are complementary; that is, the notches of onebar are opposite the projections of its companion bar. Theinterconnection between the bars of each pair of bars l5 by means of therocker members 25 and 21 prevents the simultaneous depression of two keylevers. If an attempt is made to move or operate more than one keylever, the key levers can only be depressed for a short distance, whenthey will be blocked by the high portions of the permutation bars. Bythis construction, the simultaneous depression of two key levers and theperforation of an incorrect code combination is prevented.

When the keyboard mechanism, according to the present invention, isemployed in combination with a transmitter, a series of levers 20 isprovided pivotally articulated to the permutation bars 28. Thisarrangement is clearly described in Patent No. 1,965,572 to C. W. Burckyet al. which has already been referred to.

The perforator disclosed in Fig. 1 comprises a set of code punches 29movable through openings in upper and lower guide plates 3| and 32 andcooperative with a die plate 33 to perforate a tape 34. The plates 3|and 33 are spaced apart to form a tape guide. Intermediate the guideplates 3| and 32 is a retract plate 35 which cooperates with shoulderson the code punches 29. and a feed-hole punch pin (not shown), and dueto the action of springs 35 operates to re. move the. punches clear ofthe tape following the operation of a punch hammer 3'1. The code punches29 are selectively operated by the actuating member or punch hammer 31through the instrumentality of a set of punch interponent bars 33corresponding in number to'the punches 29. Operatively associated witheach of thebars 38 is a pivoted arm 39 mounted on pivot rod 68,

and connected to. a permutation bar 28 by means of a link 4|.

The hammer 31 rocks about its shaft 42. and forms the armature of anelectromagnet 43. The punch hammer 31 comprises a comb portion 44through which the assembly is pivotally mounted on shaft 42.. Secured tocomb portion 44 is a member 45.which extends rightwardly and leftwardlytherefrom (as viewed in Fig. 1). The member 45 and the lateral portion48 of the comb or guide portion 44 are to be considered as the punchoperating unit or the unit through which the punches 29 are operatedpermutatively in accordance with the setting of punch interponents 38,which are'set permutably into or out of alignment with the punches bythe actuation of the permutation bars 28 in response to the depressionof the key levers I4. Also secured to the member 45 by screws 41 (Fig.6) is an armature 48 positioned above a pair of coils of theelectromagnet 43'.

When'the perforating magnet 43 is not energized, the hammer 31 isretained in its counterclockwise position against an adjustable stop 52by a spring 53 (as shown in Fig. 1). However, upon energization ofmagnet 43 to perform a perforating operation, the hammer 3| is rocked toits clockwise position against a stop 54 in opposition to the spring'53,and in this position (Fig. 4) the punches will be operated'to effect theperforation of the tape.

A pawl member 55 is pivotally carried at the left-hand end of the'p-unchoperating member 45 and cooperates with ratchet teeth 55. of a feedingroller 51, which is also provided with feed pins 58 adapted to mesh withfeed holes which are invariably perforatedin the tape 34. Thus,

when' the magnet 43 is energized and the hammer 31 is rocked toitsclockwiseposition, pawl 55 is raised to; engage a; tooth 56 on thefeeding roller 51. Then, upon de-energization of magnet 43-, spring 53actuates the; hammer 31 to its counterclockwise position and draws thepawl 55 downwardly, which movement causes the feeding roller 51 to berotated counterclockwise one angular step to efiect the spacing of thetape 34 one unit distance.

There is mounted on the frame 59 a bracket 6| and pivotally mounted at62 on said bracket is a latch lever 63 and a curb member 64. Lever 63 isnormally biased in a clockwise direction by a spring 65, and member 64is normally biased in a counterclockwise direction by a spring 66. Acontact operating lever 61 is pivotally mounted on the pivot rod 68 andis connected by an adjustable link 69 to the universal bar (not shown)but which is comparable to one of the permutation bars 28 and which isoperated invariably upon the depression of a key lever I4. Lever 61 isprovided with a laterally projecting portion II which cooperates withthe latch 63 and the curb bar 64. Lever 67 is also provided with aninsulated portion 12 which cooperates with contact spring 13. Latchlever 63 isprovided with an arm I4 which cooperates with a striker pinI5 carried by the armature 48 of the punch magnet 43. Curb member 64 isprovided with an arm 16 which cooperates with the lower flange II! of aU-shaped member 11 secured to the armature 48. Specifically, as shown inFigs. 2 and 6, the upper flange of the U-shaped member 11 is secured toplate 59 of armature 48 by nut 69 (Fig. 2) while the lower flange 18, aspreviously indicated, coacts with said arm I6.

Pivotally mounted at I8 on the bracket 6| is an anti-chatter member I9.Member I9 is provided with a horizontal arm 8I which cooperates with astud 82 carried on the armature 48. Member I9 is also provided with adepending arm83 which acts on a contact spring 85 of the pair of contactsprings '13 and 85. Member I9 is normally biased counterclockwise by aspring 84 extended between an arm I of member I9 and armature 48 (Fig.2) the arm 8| being urged into contactwith the stud 82 carried by thearmature 48.

As indicated in Fig. l, the punch mechanism is of the form shown in U.S. Patent No. 2,255,794, granted September 16, 1941, to R. A. Lake,whereby the punches 29 are utilized to so pierce the tape material 34 asto leave an uncut portion which serves as a hinge, thus resulting in ahinged lid which will yield to the sensing pins in a telegraphtransmitter when the tape is employed for automatic control of signaltransmission. To facilitate the back spacing of such tape having liddedapertures, the present invention provides a tape tearing knife 9I ofspecial design, having a bevel directed as shown in Fig. 1 to cam downthe lids, and thus preclude said lids from being caught by the sharpedge of the tearing blade or knife and bent back. In the punch mechanismaccording to the above referred to R. A. Lake patent, a series ofspring-loaded ejectors I are provided for ejecting the hinged lids fromthe die plate to facilitate the advancement of the tape through thepunch mechanism. In order that the tape may be readily moved in areverse direction for a back spacing operation, each of the ejectors 5|is provided with a wing portion 49 having an inclined lower edge, sothat as the tape 34 is moved rightwardly (as viewed in Fig. 1) for backspacing, any of the hinged lids which may be projecting upwardly at anangle will be cammed downwardly by the wing portion 49 so as to clearthe die plate.

The back spacing mechanism is shownin Fig. 7 and consists of a mainlever 92 pivoted at 93 to the frame 58. Lever 92 comprises a thumbportion 94 and arms 95 and 96. Secured to the extremity of arm 95 is alaterally projecting pin 91, which cooperates with the bent upper endof, feed pawl 55 in such a manner that when lever 92 is rotatedclockwise, pin 9'! acts to cam the pawl 55 leftwardly to disengage thepawl tooth from the tape feed ratchet teeth 56. The arm 96 carriespivoted at its extremity, a back spacer pawl 98 having arms 99 and IUI.Pawl 98 is normally biased in a clockwise direction by a spring I02 tobring arm 99 thereof against a stud I03 mounted on arm 96 of lever 92.Thus, when lever 92 is rotated clockwise to effect back spacing of tape34, the pin 91 acts to cam pawl 55 out of mesh with the feed ratchetjust prior to the cooperation of arm I8I of back space pawl 98 with atooth on the star wheel I04 to cause the star wheel I94 to rotate oneangular step in a clockwise direction. The star wheel I04 is held inposition by a spring actuated detent I05. Lever 92 is normally biasedcounterclockwise by a spring General operation In the operation of themechanism according to the present invention, the depression of a keylever I4 will set the bars I? and I8 of the pairs of permutation bars I6characteristically according to the code identified by the operated keylever. The rocker members 25 and 27 will be correspondingly rocked toset the permutation bars 28 in their rightward or leftward positionwhich, through links 44, will move the levers 39 to their clockwise orcounterclockwise position to set the interponents 38 correspondingly toblock or clear the punches 29. The key lever I4 also acts upon auniversal bar, as described in the Patent No. 1,965,572 to C. W. Burckyet a1. granted July 10, 1934, in which the operation of the universalbar is specifically described, to move a bar similar to bar 28, whichacts through a link 69 to rotate the contact operating lever 61counterclockwise to permit the projection H of the operating lever 61 tobecome latched by the latch lever 63. During this movement of the lever61 the contact spring '!3 is permitted to follow the insulated portionI2 to bring the contacts on springs 13 and closer together, as seen inFig. 2. The arrangement is so constructed that when the latch 63 fallsinto latching position relative to the contact operating lever 61 (asshown in Fig. 2), the contacts I3 and 85 will not close at this time,but will be drawn very close together. Upon the continuedcounterclockwise rotation of lever 61, the contacts on springs 13 and 85will close. It is understood, of course, that the depression of the keylever is deemed to be a continuous movement, and what appears to hesteps herein are merely transient conditions which arise during theoperation of the key lever. When the contacts on springs l3 and 85 arethus permitted to close, an obvious operating circuit 86 (Fig. 6) isclosed to cause the energization of the punch magnet 43. The armature 48is attracted, causing the punch hammer 3'? to rotate clockwise about itspivot 42. During the very early portion of the movement of the armature48 toward the poles of the punch magnet 43, the anti-chatter member I9will, through its arm 8|, follow the stud 82 of the armature 49 to beginits counterclockwise rotation under the influence of its spring 84, andin so doing, carry the contact springs 13 and 85 (through its dependingarm 83) rightwardly as seen in Fig. l) to take the control of thesecontacts out of the control of the contact operating lever 61. As thearmature 48 is drawn closer to the poles of the magnet 43', as shown inFig. 3, the U-shaped member 11 moves away from arm 16 of the curb member64' and permits the curb member 64 to be rotated counterclockwise by itsspring 66 to the position shown, wherein the curb member bears againstthe underside'of the lateral portion H of the contact operating lever61. When the operator releases the key, the contact operating lever 61is free to move slightly in a clockwise direction as viewed in Fig. 2.When the punch hammer 31 is rotated clockwise and stud contacts with thearm 14 of latching lever 63, lever 63 is rotated in a counterclockwisedirection away from the laterally extending portion H of the contactcontrolling lever 61. The curb member 64 which prior to this movement ofthe latching lever 63 was urged in a counterclockwise direction by theinfluence of spring 66 against the laterally extending portion ll ofcontact controlling lever G1, is now permitted to move upwardly so thatthe notched portion of the curb lever 64 moves into a position to blocka repeat operation of the contact controlling lever El. Moreover, thecounterclockwise rotation of lever 19 under the influence of spring 84having been limited by a stop 38, a gap between arm 8| and stud 82 andbetween insulation I2 and contact spring 13 will appear, as seen in Fig.3.

Upon reaching its full clockwise position against the poles of the punchmagnet 43, the armature 48, through its striker member '15, acts uponarm 14 of latch 63 to rotate said latch counterclockwise about the pivot62 against the tension of spring 55. as shown in Fi 4, thus permitting,if the key lever M has been released, the contact operating lever 61 tobe actuated clockwise by its spring 31 against a suitable adjustablestop 88 (Fig. 1). Shortly after the lever 6!- begins to return to itsrightward position, the curb member 64 is actuated by its spring 56 tobring the shoulder thereon into the path of the lateral portion M (Fig.5). If an attempt is madethereafter to reoperate the contact operatinglever 61 before the punch hammer 3'! is returned fully to itscounterclockwise position against stop 52 (at which point the feedingoperation is completed), the leftward movement of the contact operatinglever 61 will be obstructed by the shoulder onthe curb bar 64. As shownin Fig. 5, the curb member 64 remains effective to block movement of thelever 6'! until approximately the completion of the upward movement ofarmature 4B (or the counterclockwise movement of member 3D, whereat thecurb member 64 will be engaged and rotated by the U-shaped member I? torotate the curb member 64 clockwise against-the tension of its spring 85to disengage the shoulder of the curb member 64 from the lateralprojection H of the punch contact operating lever 51. By this latterfeature of this invention, a complete and invariable feeding operationon the tape 34. is assured with each operation of the punch hammer 31,and the reoperation of a key lever, before the completion of a feedingoperation, is preeluded.

Although a specific embodiment of the invention has been disclosedherein, it is understood that all forms which come within the scope ofequivalency of the appended claims are intended to be embraced thereby.

What is' claimed is:

1. In a perforator, an-electroma'gnet-ically con trolled punch actuator,a circuit therefor, a contact in said circuit, control means for saidcontact, and means effective by the actuation of said actuator tosupplement the prior control of said control means to preclude prematurereoperation of said actuator,

2. In a keyboard perforator, a series of keys, an electromagneticallycontrolled punch actuator, a circuit therefor, a contact in saidcircuit, means controlled by said keys for governing the operationofsaid contact, and means effective by the actuation of said actuator tosupplement the prior control ofsaid governing means to precludepremature reoperation of said actuator.

3. In a perforator, an electromagnetically controlled punch actuator, acircuit therefor, a contact in said circuit, anti-chatter means forgoverning the operation of said contact, latch means for promoting thecompletion of operation of said punch actuator, and curb means effectiveupon operation of said actuator to supplement the prior control of saidgoverning means to insure invariably the complete operation of saidactuator.

4. In a perforator, an electromagnetically controlled punch actuator, acircuit therefor, a contact in said circuit, anti-chatter control meansfor said contact, a latch means to promote the operation of said punchactuator in response to the closure of said contact, and blocking meanseffective upon the operation of said actuator to supplement the priorcontrol of said control means to insure invariably the completeoperation of said actuator.

5. Ina perforator, an electromagnetically controlled punch actuator,acircuit therefor, a contact in said circuit, a contact operating lever,an anti-chatter means controlled by the armature of the punch actuatormagnet and effective upon operation of said lever, a latch meanscooperable with said lever to promote the operation of the punchactuator magnet, andcurb means effective upon operation of said actuatorto supplement the prior control of said governing means to insureinvariably the complete operation of said actuator.

6. In a keyboard perforator, a series of keys, an electromagneticallycontrolled punch actuator, acircuit therefor, a contacti'n said circuit,means controlled by said keys for governing the opera-- tion of saidcontact to operate said actuator, a tape stepping means operated by saidpunch actuator, and curb means rendered effective by said actuator toprevent premature reoperation of said actuator to insure invariably thecomplete operation of said tapestepping means,

7. In a perforator, an electromagnetically operated punch actuator,contact means to control the operation thereof, control means for saidcontact means to initiate the operation of said actuator, andpermissively operated means'controlled by said actuator to supplementthe prior effect of said control means to insure the com-' pleteoperation of said actuator.

8. In a perforator, an electromagnetically operated punch actuator,contact means to control the operation thereof, control means for saidcontact means to initiate the operation'of said actuator, permissivelyoperated means controlled by said actuator to supplement the prioreifect of said control means to insure'the operation of said actuator,and curb means for preventing premature reope'ration of said controlmeans.

9'. In a perforator, an electromagnetically op- 3 erated punch actuator,contact means to control the operation thereof, control means for saidcontact means to initiate the operation of said actuator, permissivelyoperated means controlled by said actuator to supplement the priorefiect of said control means to insure the operation of said actuator,tape stepping means operated by said punch actuator, and curb means forpreventing the premature reoperation of said tape stepping means.

10. In a keyboard perforator, a series of keys, a punch actuator, meansfor operating said actuator, means controlled by said keys to controlsaid first recited means to initiate the operation of said actuator, andpermissively operated means controlled by said actuator to supplementthe prior effect of said second recited means to insure the completeoperation of said actuator.

11. In a keyboard perforator, a series of keys, a punch actuator, meansto control the operation of said actuator, contacts controlled by saidkeys to control said means to initiate the operation of said actuator,permissively operated means controlled by said actuator to maintain saidcontacts closed independently of the key operated, and means to preventpremature reoperation of said actuator.

12. In a keyboard perforator, a series of keys, a punch actuator, meansto control the operation of said actuator, contacts controlled by saidkeys to control said means to initiate the operation of said actuator,permissively operated means controlled by said actuator to maintain saidcontacts closed independently of the key operated, and curb means forpreventing premature reoperation of said actuator.

13. In combination, means for producing lidded apertures in a signalcontrol strip comprising punch and die means, strip advancing means,ejecting means cooperable with said punch and die means to facilitatethe operation of said advancing means, means for effecting the reversemovement of said strip advancing means, guide means associated with saidejecting means for guiding the lids of said apertures to facilitate thereverse movement of said strip advancing means, and strip severing meanscontoured to cooperate with said guide means during the reverse movementof said strip advancing means.

14. In combination, means for producing lidded apertures in a tapecomprising punch and die means, tape feeding means, spring loadedejectors cooperative with said punch and die means to level the lids ofsaid apertures substan tially into the plane of said strip to facilitatethe normal progressive operation of said feeding means. means foreffecting the reverse movement of said tape feeding means, guide meansassociated with said ejecting means for guiding the lids of saidapertures to facilitate the reverse movement of said tape feeding means,and tape severing means contoured to cooperate with said guide meansduring the reverse movement of said tape feeding means.

15. In a keyboard perforator, a series of keys, an electromagneticallycontrolled punch actuator, a circuit therefor, a contact in saidcircuit, anti-chatter means controlled by said keys for governing theoperation of said contact, latch means for promoting th completion ofoperation of said punch actuator, and curb means effective uponoperation of said actuator to supplement the prior control of saidgoverning means to insure invariably the complete operation of saidactuator.

16. A perforating mechanism including punch elements and anelectromagnetic punch operator, contacts for controlling saidelectromagnetic punch operator for operation, means for selecting saidpunch elements for operation and for operating said contacts to effectthe energization of said electromagnetic punch operator, supplementalcontact controlling means to maintain said contacts operated for theduration of operation of said punch operator, and means controlled bysaid punch operator for rendering said first recited means ineffectiveon said contacts for said duration to prevent premature reoperation ofsaid punch operator.

17. In a perforator, an electromagnetically operated punch actuator,contact means to control the operation thereof, control means for saidcontact means to initiate the operation of said actuator, permissivelyoperated means controlled by said actuator to supplement the priorelTect of said control means to insure the operation of said actuator,tape stepping means operated by said punch actuator, and blocking meansfor preventing the reoperation of said control means until said tapestepping means has completed its cycle of operation.

18. In a perforator, a punch actuator, means to control the operation ofsaid actuator, contacts to control said means to initiate the operationof said actuator, permissively operated means controlled directly bysaid actuator to maintain said contacts closed to insure the completeoperation of said actuator, and means to prevent premature reoperationof said actuator.

19. In a perforator, a punch actuator, means to control the operation ofsaid actuator, contacts to control said means to initiate the operationof said actuator, permissively operated means controlled by saidactuator to maintain said contacts closed to insure the completeoperation of said actuator, and means for preventing the reoperation ofsaid first mentioned means until said actuator has completed its cycleof operation.

20. In a tape perforator, an electromagnetically operated punchactuator, contacts for operating said actuator, means to control theoperation of said contacts, means to latch saidcontrol means to promotethe operation of said punch actuator, and means controlled by saidactuator to maintain said contacts in their operated position until thepunching operation is completed.

21. In a tape perforator, an electromagnetically operated punchactuator, a switch for controlling the operation of said actuator, meansto control the operation of said switch, means to latch said controlmeans prior to the operation of said switch, and means controlled bysaid actuator to maintain said switch in its operated condition untilthe punching operation is completed.

22. In a tape perforator, an electromagnetically operated punchactuator, a switch for operating said actuator, means to control theoperation of said switch, a latch for latching said control means priorto the operation of said switch, and means controlled by said actuatorto insure completion of the punching operation.

23. In a tape feeding means, an electromagnetically operated feedactuator, contact means to control the operation thereof, control meansfor said contact means to initiate the operation of said actuator, andblocking means controlled by said actuator to prevent the reoperation ofsaid contact means until the complete operation of said feed actuator.

24. In a tape perforator, an electromagnetically operated punchactuator, contacts for operating said actuator, control means foroperating said contacts, a latch for latching said control means priorto the closure of said contacts, means to maintain said contactsoperated until the punching operation is completed, tape feeding meansoperable by said punch actuator, and blocking means operable by saidpunch actuator to prevent a reoperation of said contacts until thefeeding operation is completed.

25. In a recorder, recording means, an actuator therefor, means forcontrolling the operation of said actuator, and permissively operatedmeans operable by said actuator and eifective upon operation of saidactuator for supplementing the prior control of said means to insure thecompletion of operation of said actuator.

26. In a recorder, recording means, an actuator therefor, means forcontrolling the operation of said actuator, means operable by saidactuator for supplementing the prior control of said means to insure thecompletion of operation of said actuator, and means to preclude thepremature reoperation of said actuator.

27. In combination, a tape feeding device susceptible of an incompletecycle of operation, actuating means for said tape feeding device,control means for operating said actuating means, means to operate saidcontrol means to initiate the operation of said tape feeding means, andmeans to prevent the reoperation of said control means until a completecycle of operation is performed.

28. In combination, a tape feeding and perforating device susceptible ofan incomplet cycle of operation, actuating means for said device, saiddevice being operable in a portion of its cycle to perform a perforatingoperation and in a full cycle of its operation to perform a feedingoperation, control means for operating said actuating means, means tooperate said control means, and means to prevent the reoperation of saidcontrol means until a complete cycle of operation is performed.

29. In combination, a tape perforator susceptible of an incomplete cycleof operation, actuating means for said perforator, control meansfor'operating said actuating means, means to operate said control meansto initiate the operation of said perforator, and means controlleddirectly by said actuator to prevent the reoperation of said controlmeans until a complete cycle of operation is performed.

30, In combination, a perforator susceptible of an incomplete cycle ofoperation, actuating means for said perforator, control means forinitiating the operation of said actuating means,-

and means operated by said actuating means to prevent the reoperation ofsaid control means until a complete cycle of operation is performed.

31. In combination, a material feeding device susceptible of anincomplete cycle of operation, actuating means for said feeding device,control means for initiating the operation of said feeding device, andmeans operated by said actuating means to prevent the reoperation ofsaid control means until a complete cycle of operation is performed.

32. In combination, a perfcrator susceptible of an incompleteperforating operation, actuating means for said perforator, controlmeans for initiating the operation of said actuating means, means forlatching said control means upon the operation thereof, and meansoperated by said actuating means for insuring the completion of theperforating operation.

33. In combination, a perforator, an electromagnetic actuator for saidperforator, control means for operating said actuator, means forlatching said control means upon the operation thereof, and meansoperated by said actuator for insuring the completion of the perforatingoperation.

34. In a perforator, a punch actuator, an elec-.

trcmagnet for controlling said actuator, a switch for controlling saidelectromagnet, a control lever for initially operating said switch,means for operating said control lever, a latch for latching saidcontrol lever prior to the operation of said switch, and a memberreleasable directly and instantaneously by said actuator upon theoperation thereof for maintaining said switch in its operated conditionduring a punching operation.

ROSS A. LAKE.

